Two more teenagers have been charged over allegedly lighting a fire at the Cessnock McDonald's.
Four teenagers - two boys and two girls - had been charged last Thursday over the incident. They remain before the courts.
Following ongoing inquiries, a 15-year-old boy attended Cessnock Police Station and was arrested at about 2pm on Sunday.
He was charged with damaging property by fire and was granted conditional bail to appear at a children's court on Monday, August 11.
And then on Monday at about 10am police went to a home on Mayfield Street, Cessnock, and arrested a 15-year-old girl.
She was taken to Cessnock Police Station and also charged. She too was was granted conditional bail to appear at court on August 11.
Emergency services were called to the fire on Allandale Road at about 3.30am on Sunday, July 19, after reports of a fire within the external playground area.
Crews from Fire and Rescue NSW extinguished the fire a short time later.
Officers from Hunter Valley Police District commenced an investigation into the cause of the blaze.